Attachment for gas-stoves



PATBNTBD PEB. 2.3, 1904.

L. H. BEAR.l n ATTAGHMENTMPOR GAS sToVEs.

APPLICATION FILED JULY 3l, 1903.

N0 MODEL.

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Patented February 23, 1904.

UNITED STATES PATENT OFFICE.

LEWIS H. BEAR, OETERRE HAUTE, INDIANA.

ATTACHMENT `Fon GAS-STOVES.

SPECIFICATION forming part of Letters Patent No. $552,749, dated February 23, 1904. Application filed Julyl, 1903. Serial No. 167,726. (Nov model.)

T0 @ZZ whom t may concern:

Be it known that I, LEWIS H. BEAR, a citizen of the United States, residing at Terre Haute,

inthe county of Vigo and State of Indiana,

and exact description of the invention, Such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to gas stoves and heaters, and contemplates the provision of an improved appliance adapted for convenient attachment to existing stoves and heaters for automatically regulating the gas-supply to the burner and for maintaining a pilot-name to ignite the gas at the latter upon the resumption ofthe supply.

The nature of the improvements will be readily comprehended, reference being had to the following detailed description and to the accompanying drawings, in which- Figure 1 is a vertical sectional view of an attachment embodying my invention, shown as applied to a gas stove or heater. Fig. 2 is a plan view of the attachment. Fig. 3 is an enlarged vertical sectional view of the casing and valve. Fig. 4 is an enlarged sectional view showing the pilot-flame tube and valve-moving means. Y

Referring to the drawings by numerals, l denotes the frame of a gas stove or heater, and 2 is the air-and-gas-mixing tube leading to the burner 3. The spider is shown at 1. In the gas-supply pipe 5 is a needle-valve con- V trolled by a handle 6, and also a threaded upper chamber 11, to which is connected the supply-pipe branch 7, and into a lower chamber 12, the latter communicating with the aperture of a reduced extension 13, entering the mixing-tube. In the partition is an opening affording communication between the chambers, and at said opening. is a valve 14, the `stern 15 of which extends through and beyond the top and bottom of the casing. At the bottom opening for the valve-stem is a stuffingbox 16, and the upper end of the stem is movable in an' apertured plug 17 and a stuiingboX 18. The lower end of the stem is threaded and receives a nut 19, and said, nut and a washer serve to confine a spring 20, coiled around the stem and interposed between said washer and casing,l the spring operating to seat the valve. 'Ihe tension of the spring is regulated by the nut 19. The upper end of the stem is likewise threaded, and screwed thereon is a collar 21, having an annular groove 22.

In the casing-top is a threaded opening, into which is screwed the lower end of a coupling 23.

24 is a leverLpreferably of inverted-U form in cross-section and having a bifurcated end 25 engaging the groove 22 of the collar 21. The lever is intermediately pivoted to the upper end of the coupling 28 by a pin 26 passed through the depending portions of flanges of the lever and through said coupling. The lever extends at its other end through an open-A ing in the frame and beyond the opening in the stove or heater top for the spider 4:. In the coupling is a vertical aperture 27, communicatingV with the upper chamberll and also with a lateral threaded opening in said coupling and in which is screwed the inner end of a pilot-Haine tube 28. The outer end of said tube 28 is. in close proximity to the burner 3. In the aperture 27 of the coupling is a handcontrolled valve 29, having a handle 30.

In operation the lever is adjusted by turning the sleeve 21 to bring its outer or free end in position to support the spider above the top of the stove or heater. The valve 29 is adjusted to admit a supply of gas tothe tube 28 sufficient to maintain a small pilot-fiame 4at the nipple whereby to effect instantaneous ignition at the burner 3. Theva'lve 14 is normally seated by the action of the spring,` the tension of which is sufficient to overcome the Weight of the spider resting on the lever 24C, and the supply of gas to the burner is cut'oH. When a utensil or the like is placed on the IOO spider, the added Weight causes the depression of the spider and outer end of the lever and the elevation of the opposite end of the latter and with it the valve-stem and valve. The valve being raised from its seat,- the gas iiows by the chamber 12 and extension 13 through the mixing-tube to the burner, at Which latter it is ignited by the pilot-llame. While the utensil occupies the spider the flame at the burner is maintained; but the instant the utensil is removed the spring acts to retract the valve to its seat and cut off the gas-supply, the other parts also returning to normal position. The burner is thus in operation only when heat therefrom is desired, and this results in a very considerable saving, which is not offset by the maintenance of the pilotllame, only avery small quantity of gas being necessary for this purpose.

It will be noted that in addition to the simplicity of construction of the attachment it is readily tted to existing stoves Without necessity of modification.

I claim as my invention- 1. In combination with a burner, a gas-supply passage and a support for a utensil or the like, of a valve in said passage, a stem below the valve connected With a spring for normally seating the valve, a device for adjusting the tension of the spring, a stem above the valve havingan adjustable collar, and a pivoted lever connected at one end With said collar and serving at its other end to normally elevate the support.

2. In combination a casing divided by a partition into two chambers the upper one of Which is connected With a gas-supply and the other With a burner, a controllable pilotllame tube connected with the upper chamber, a spring-retracted valve at an opening in said partition, and a pivoted lever connected With the valve and arranged to be moved to unseat the latter by the applied Weight of a utensil or the like.

In testimony whereof I aliX my signature in presence of two Witnesses.

LEWIS H. BEAR.

Witnesses:

JOHN H. CHEEK, EMMA. WHEATFILL. 

